fastgun:
Welcome to the Forum, and congratulations on the R9s.
The Colt Mustang was my "24/7 piece" back in the day -- after the Walther PPK and before the NAA Guardian. Although mine is now a "safe queen," it is still one of my favorite handguns.
For some reason, the Mustang has always been a very accurate design for me. I remember one time back in the 80's a friend of mine purchased a Mustang on my recommendation and then came to me complaining that he couldn't hit a *&^% thing with it. We took the pistol out to the range he had consturcted behind his barn where he proceeded to prove his point at 25 yards. I examined the pistol, found nothing amiss, inserted a fresh magazine, and then managed to hit the "10 ring" on the first shot. Knowing to quit while I was ahead, I engaged the safety, handed the Mustang back to its owner, and said, "You may just need to practice a little more."
(I love moments like that.
)